<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    let num=10;
    console.log(num)
    console.log(typeof num)
    let str=prompt('请输入您的年龄')
    console.log(str)

  </script>
</head>
<body>

</body>
</html>